Pump



June 4, 1935. A. c. DURDIN. an 03,

PUMP

Filed Oct. 13, 1935 Jlll INVENTOR.

vii/9:15 5 600/11 17,

. l BY 4 ATTORNEY.

Patented June 4, 1935 PUMP Augustus G. Durdin, 3d, Chicago, 111.,assignor to Chicago Pump. Company, C

poration or, Illinois hicago, 111., a cor- Aspnaamom 13, 1933, SerialN6. 693,439

3Claims.

This invention relates to pumps, and more particularly to centrifugal orrotary pumps, and it has reference more especially to the impellers orrotors used in pumps of this character.

An object of this invention is to obtainincreased efliciencyand tomaintain as simple and inexpensive a construction as is possible. Oneobjection which prevails in pumps of this class is that considerablefriction is developed between the liquid and the'circular or end wall ofthe pump casing, the impellers of the pumps, now on the market, actingto throw the liquid against the end wall while forcing it from thesuction inlet to the discharge outlet.

Usually buckets are provided in the two faces of the impeller adjacentor at the periphery of the disc, which buckets force the liquid along,and due to the centrifugal action, the liquid is thrown outward againstthe end wall of the chamber in which the impeller rotates, causingfriction which hinders the flow of the liquid.

In accordance with the present invention, the bottoms of the buckets areso shaped that the water or other liquid is thrown in a lateraldirection from the impeller, whereby it does not impinge upon the endwall of the chamber, thereby friction between the flowing liquid and thewalls of the chamber. As a result a greater quantity of liquid can bepumped with a pump of given size using the same power.

The invention consists in the several novel featureshereinafter fullyset forth and claimed.

The invention is clearly illustrated in the accompanying drawing, inwhich- Fig. 1 is a side elevation, partly broken away,

' of a pump embodying a simple form of the present invention;

Fig. 2 is a view, partly'in end elevation and partly in central verticalsection taken on the line 22 of Fig. 1;

Fig. 3 is a detail fragmental side elevation of the impeller, and

Fig. 4 is a detail fragmental cross section taken on the line 44 of Fig.3.

Referring to said drawing, the reference character l0 designates ahousing, provided with a hollow boss II, in which is contained a bearingbushing l5 for a shaft I5. Desirably packing I3 and a gland l2, with itsusual bolts (one of which is shown at [4) are provided for making atight joint around the shaft.

The casing is. provided with an end plate I! held on the casing by capscrews l8, and the casing is provided with a suction inlet l9 and adischarge outlet 20 separated by a common wall 2| within the casingproper.

An annular flange 22, formed on the inner face of the wall l0 of thecasing, and a corresponding flange 23 formed on the inner face of 5 theend plate l1, divide the casing into a single race-way or chamber 24,and two other chambers. 25, 26. The water or other liquid is forcedthrough the single chamber 24 from the suction inlet I9 to the dischargeoutlet 20.

The impeller 30 has a disc like portion 32, and a hub 21 carried by theshaft l6. Desirably the disc like portion is formed with an annulargroove 28 in each side face, and equalizing passages, one of which isshown at '29, are 15 formed in the disc within the grooves 28 toequalize the pressure in the chambers 25, 26. The opposite faces of thedisc like'portionfif the impeller are machined smooth and parallel andthe peripheral edge is machined smooth.

(The peripheral portion of the impeller extends between the flanges 22,23 and into the chamber 24, with its periphery spaced considerably awayfromthe end wall Ill of the casing so as to leave a free space betweenthe peripheral face and the side faces of the peripheral portion of thedisc andthe end and side walls of the chamber 24. v

Adjacent its periphery thedisc is provided in both of its side faceswith circumferentially disposed buckets that urge the water or oth erliquid forward in the chamber 24. The bottoms 3| of the buckets aredesirably concave or curved,

. being directed inwardly from the sides of the disc and outwardly tothe periphery of the disc 35 along'curved lines that approach the edgesof the disc. It will be observed from an inspection of Fig. 2 that thearcs which define the bottoms of the pockets, are parts of circlesstruck from centres located between the side walls 0f 40 the casing andthe disc. As a result, lines parallel with the axis of the impellerand-tangent with the outer parts of circles, struck from-the centres ofthe arcs, are radially within the outer wall. The sides of the bucketscomprise webs 4o 1 33, desirably formed of rectangular plates that arelet into slots 34 formed in the peripheral portion of the disc andsecured therein by weld-- ing, brazing or otherwise permanently securingthem in place.

Desirably the buckets may be formed as fol-' lows: Both sides of theperipheral portion of, the disc are machined to form annular grooves orrecesses 3|, the bottoms of which are arcuate and intersect the sidesand peripheral edge of the disc pled to the pump shaft. Water is drawnthrough the suction inlet, and forced through the chamber 24 to thedischarge outlet. While passing through the chamber 24 the water isrepeatedly caught by the buckets of the impeller and is thrown therefrominto the single race-way or chamber 24 taking substantially helicalpaths at both sides of the impeller, a very minimum amount of the waterbeing thrown against the end wall l0, consequently friction between theflowing water and end wall is practically reduced to a minimum. Thearrows in Fig. 2 indicate generally the direction taken by the waterentering and leaving the buckets.- As a result the helically movingwater drives forward the body of water contained in the outer part ofthe raceway, because the helically moving water, when leaving thebuckets is thrown against the surrounding water when following its pathback to the pockets. The-energy imparted to the helically moving waterby the impeller, develops pressure in the outer body of water;

It will be apparent that by rig the friction between the flowing waterand the end wall, the efliciency of the pump is greatly increased andthat a greater quantity of liquid can be pumped with a pump of givensize, using the same power.

I claim as new and desire to secure by Letters Patent:

1. In combination, a pump casing havinga suction inlet, a dischargeoutlet and a single raceway therebetween having side and inner and outerend walls, an impeller disc mounted'to rotate in said casing with itsperipheral portion extending into said race-way. and circumferentiallydisposed buckets in the side faces of the peripheral portion of theimpeller disc having concave botliquid in the outer portion of therace-way and is directed back into the pockets by the side and inner endwalls.

2. In combination, a pump casing having a suction inlet, a dischargeoutlet and a single raceway therebetween, having side and inner andouter end walls, an impeller disc mounted to rotate in said casing withits peripheral portion extending into said race-way, andcircumferentially disposed buckets in the side faces of the peripheralportion of the impeller disc having concave bottoms, terminating at theside faces and peripheral edge of the impeller disc, the bottoms of saidbuckets being in the form of arcs of circles struck from centresdisposed between the side walls of the race-way and the sides of theimpeller disc, whereby liquid is discharged from the outer e'nds'of saidpockets in lateral directions against the liquid in the outer portionoi. the race-way, and is directed back into the pockets by the side andinner end walls.

3. In combination, a pump casing having a suction inlet, a dischargeoutlet and a. single raceway therebetween, having side and inner andouter end walls, an impeller disc mounted to to tate in said casing withits peripheral portion extending into said race-way, the parts of theraceway between the side walls thereof and the impeller disc beingnarrower than the part located between the outer end wall and theperiphery of the impeller disc, and there beingcircumferentiallydisposed buckets in the side faces of the peripheral portion of theimpeller disc, flaring outwardly in a direction from the axis of theimpeller towards its periphery, said buckets being formed by annulargrooves extending inward from the sides of the impeller disc intersectedby cross walls, the cross section of each groove being in the form of anarc of a circle struck from a centre located between the adjacent sidewall of the race-way and the side of the impeller disc. I

. AUGUSTUS C. DURDIN III.

